I, Mamiamato24 would like to sign the petition.
I do like the point you brought up, stating that there should be a time limit whereby somebody can dispute a ban. One to a few months would be enough for them to dispute a ban, and once the time limit is exceeded, the ban will be placed in a sort of "archives" section, and the person cannot dispute the ban any longer unless they privately speak to staff. Possibly, on the "banned" screen that shows up when a banned person attempts to join an MCGamer server, it could specify exactly how long they have to dispute the ban.
I also like the idea that if you delete the evidence of a banned player, you will receive the exact same length ban they received (unless it is a permanent ban, in that case you will receive a 7-day ban for your first offence).